Built between 1929 and 1951, the highway's narrow confines – which could not accommodate trucks – and sharp S exit ramps made the highway obsolete almost immediately. Maintenance was minimal, and the use of corrosive salts to de-ice the highway in winter accelerated its decay. When chunks of the highway's facade began to fall off due to lack of maintenance, and a truck and car fell through it at 14th Street in 1973, the highway was shut down, and a debate began whether to renovate it or dismantle it.[1] Attitudes about urban planning had changed in the intervening decades, and the decision was made not to repair the decaying structure.

The need to replace the deteriorating highway was recognized in the 1950s. Plans were drafted, but not executed. By 1971, a plan evolved for the elevated highway to be replaced by an underground interstate-quality highway, which came to be called Westway. It received approval from many levels of government, from the City to the Federal, but was scuttled in 1985 due to environmental issues. In the interim between the closure of the elevated highway and the completion of its dismantling, while debate about Westway was proceeding, remaining sections of the old highway structure began to be unofficially utilized as an elevated urban park, for jogging and bicycling.

Before the West Side Highway was built, the road along the Hudson River was a busy one, with significant cross traffic going to docks and ferries. At 22nd Street, most traffic continued north along 11th Avenue, along which the New York Central Railroad (NYCRR)'s West Side Line ran; it was known by many as "Death Avenue" for the many accidents caused by trains and automobiles colliding.

On February 2, 1925, it was announced that the railroad would build a combined double-decker elevated highway and freight railroad (with the highway above the railroad) for $24 million at no cost to the city. At the time, Eleventh Avenue was popularly known as "Death Avenue" due to the dangers of the surface line. The elevated structure would eliminate 106 grade crossings over 84 blocks. The proposal came about after six months of negotiations between Manhattan Borough President Julius Miller and the NYCRR. The planned highway would no longer go to the Battery, instead ending at Canal Street, meeting the Holland Tunnel (which would open to traffic on November 13, 1927). The northern terminus was set at 72nd Street and Riverside Drive. Ramps were planned at Canal Street, 23rd Street, Riverside Drive, and at least two other locations.

The Port of New York Authority opposed the plan, preferring a more forward-looking comprehensive freight distribution plan. They attacked Miller as trying to push the plan through without input from the Port Authority. The Port Authority wanted a system of inland terminals and belt-line railroads. According to Port Authority Chairman Julian Gregory, it was almost certain that NYCRR would not go along with the Port Authority plan. It was also believed that giving NYCRR elevated tracks on the west side would allow the railroad to monopolize freight and raise prices. The Port Authority believed it was primarily a freight problem, but NYCRR and New York City considered it to be a grade-crossing elimination project.

Miller responded by arguing that something had to be done right away. He said that if the Port Authority could put forward a comprehensive plan within five years, he would put his full support behind it. He also pointed out that his plan was only one part of his "comprehensive plan for the relief of traffic congestion"; he had already widened many avenues and removed several Midtown elevated railroad spurs. He said the plan would not give the NYCRR any rights they did not already have; it was merely a relocation of existing tracks. The tracks had been on the surface for 55 years despite legal action taken against them, and Miller claimed they would be there for another 50 if nothing were done. Miller also received a letter from NYCRR Vice President Ira Place, stating that the railroad would reduce freight rates if the new elevated structure were built.

On January 20, 1926, borough president Miller sent a plan for an $11 million elevated highway to be built completely on city property to the Board of Estimate. The elevated railroad was removed from the plan, since NYCRR had come up with a separate project for partially elevating and depressing their railroad (now known as the High Line). According to Miller, there were questions over who would own and maintain the dual structure. There were also objections to its height of 40 feet (12 m) and its placement at the east building line of the existing surface roads. The elevated highway was to connect to a planned parkway (now the Henry Hudson Parkway) at 72nd Street, forming a highway free from cross traffic stretching from Canal Street to 129th Street. The elevated road was to be 60 feet (18 m) wide, wide enough for six lanes of traffic; the existing surface road would carry local traffic beneath the highway. Ramps would be provided at Canal Street, Christopher Street, 14th Street, 23rd Street, 34th Street, 42nd Street, and 57th Street. Slow-moving traffic would use the left lanes, due to the left-hand ramps. This contrasts with the current method of using the left lane for passing and putting ramps on the right side, and to the method popular around the 1950s of putting ramps on whichever side was easier. The highway would "carry buses that will make both its conveniences and its beauties available to the general public", according to Miller. He suggested Hudson River Boulevard for the name of the highway.

On April 24, 1925, Governor Al Smith signed a bill authorizing the construction of the highway. Funds for the $11 million highway were to be procured by property assessments along the route; this was considered reasonable due to advantages gained from the highway by those living along the route. The road was to be 65 feet (20 m), five feet wider than Fifth Avenue, with a speed limit of at least 30 miles per hour (48 km/h), and would be 20 feet (6.1 m) off the ground. It would be built of steel, with a cement face. A three-foot (1 m) sidewalk would be built for pedestrians, although the highway was intended mainly for motor vehicles. Two-block long ramps would be provided with easy grades for entering and exiting the highway. Trucks would be allowed on the highway.

The Board of Estimate approved the highway, now costing $13.5 million on June 14, 1926. It was to be built so a second deck could be added at a later time for about $9 million if traffic warranted. Controller Charles W. Berry questioned the proposal until he realized the money would come from tax assessments, at which time he agreed with the project.

On November 10, 1926, the Sinking Fund Commission voted to give the city title to the waterfront property along the proposed highway. The highway plan was linked to a plan by the city for more piers for ocean steamships; since the highway required land takings between 47th Street and 51st Street, it was easier to combine the projects and prevent additional expense.

On February 17, 1927, the Board of Estimate adopted the final plans for the highway, setting a hearing date of March 24. It was split into two sections, Section one went from Canal Street to 59th Street. Section two was to carry the road over the NYCRR's 60th Street Yard from 59th Street to 72nd Street. Section two was approved by the Board of Estimate on August 16, 1928; section one was postponed until September 27 due to objections. On October 18, the Board of Estimate approved section one.

Minor changes to the highway were approved on January 10, 1929, in response to several objections. The alignment in the Chelsea district was slightly modified to avoid proposed piers, and the path through the markets was realigned to pass over a corner of the property. In addition, the 14th Street ramps were moved to the area between 19th Street and 23rd Street, where they would spare many markets at 14th Street.

The old elevated highway, looking north towards the bridge over Canal Street

The plan was criticized by Thomas Adams, Regional Plan director, at the 1927 meeting of the Municipal Art Society. He disapproved of its ugliness and noise, and suggested simply clearing obstructions to the existing surface road to speed traffic. Adams also supported a comprehensive regional plan for development in the Hudson Valley. The Fine Arts Federation also opposed the highway, saying that elevated structures were unsightly, and that if the existing street were cleared a new highway might not be required.

The City Club and New York City Mayor Jimmy Walker objected to the highway on the grounds that it would block waterfront-bound freight traffic. They believed that the plans should wait until the surface railroad tracks were removed in the area, at which point the elevated highway might not be necessary. Parallels were drawn with elevated passenger railroads, which were being torn down at the time; Henry Curran of the City Club called elevated structures "a misfit in New York". The City Club also objected to more passenger cars in downtown Manhattan.

An alternate plan was put forth by John Hencken, an engineer, and approved by Ernest P. Goodrich, consulting engineer to the Regional Plan of New York and its Environs. A linear corridor would be built from the Battery to Yonkers. A freight railroad would lie underground. On ground level would be roads alongside the corridor and an indoor enclosed sidewalk. The mezzanine, between the first and second floors, would be occupied by office space. The second floor would carry a "continuous noiseless moving platform system for passenger service", with adjacent belts moving at various speeds, for a maximum of 21 miles per hour (34 km/h) in the middle. This service would be free, and would be a substitute for new subways in the corridor. Above the second floor would be about ten stories of apartments, offices, businesses, and other uses appropriate for the neighborhoods; these would be the main source of revenue to pay for the project. A high-speed motor parkway, open to passenger cars only, would lie on top. Cars would reach the upper level via ramps at both ends and elevators at convenient intervals.

Dr. Benjamin Battin, a professor at Swarthmore College, Pennsylvania, had a similar plan for an eight-story high boulevard. The street level and first floor would be connected to the Hudson River piers. The second and third stories would carry electric passenger trains, with the second floor carrying northbound traffic and southbound traffic using the third floor. A public garage would occupy the fourth and fifth floors, helping to pay off the bonds for the project. The sixth and seventh floors would carry one-way passenger car traffic, permitting speeds of up to 50 miles per hour (80 km/h). A reversible roadway, carrying cars in the direction of rush hour traffic, would occupy the eighth and ninth (top) levels. Ramps to the upper car levels would be provided every 15-20 blocks.

Construction on the first 1.5-mile (2.5 km) section, from Canal Street to 22nd Street, was started on May 24, 1929, and the road was officially opened on November 13, 1930. Traffic was not permitted on the structure until November 17 due to unanticipated delays in cosmetic work. A speed limit of 35 miles per hour (55 km/h) was set by Police Commissioner Edward Mulrooney, and trucks were temporarily banned. On the first Sunday the road was in operation, the northbound roadway was backed up for a mile approaching the north end at 23rd Street. The northbound offramp at 23rd Street, unlike the temporary southbound onramp, was built as a permanent single lane ramp, since in the future most traffic would continue along the not-yet-finished elevated highway. Suggested fixes included a new temporary ramp to 25th Street and conversion of the temporary southbound onramp to two-way traffic. The second Sunday the road was open, rain cut down on the traffic, but police had orders to open the permanent ramp eventually intended for a northbound onramp to exiting northbound traffic if traffic conditions warranted.

The elevated section with abandoned exit ramp that was to be extended to 70th Street.

The section from 59th Street to 72nd Street was begun in September 1930, and opened to traffic on March 9, 1932. The original configuration fed directly into 72nd Street, with a 90-degree turn in the road. Once the northern extension as a parkway was built, northbound traffic would turn right directly to and from 72nd Street. A southbound left-hand entrance ramp was provided at 72nd Street, with a direct ramp from Riverside Drive (later closed), and a southbound right-hand exit ramp to 70th Street was started, but never completed. This is the only elevated section that remains today, although it conflicts with the Riverside South redevelopment project and neighborhood. A covered, at-grade replacement road to facilitate a southward expansion of Riverside Park was approved by the Federal Highway Administration in 2001.

When the new city piers at 48th Street, 50th Street, and 52nd Street were being planned in late 1934, direct connections between the elevated highway and the second levels of the piers were proposed. Manhattan Borough President Samuel Levy quickly spoke against these connections, citing interference with southbound traffic on the highway. The plan, which had been proposed at the request of several cruise lines, was rejected.

In 1935, the 34th Street–Midtown Association proposed a new ramp for the highway at 34th Street. This ramp would rise above the elevated railroad and highway, splitting into a northbound onramp and a southbound offramp, both on the right side of the highway. It was hoped that the ramp would help businesses in the area and provide better access to the proposed 38th Street Tunnel (now the Lincoln Tunnel) to New Jersey. The ramp was never built.

Construction on the final section of the originally planned highway, from 46th Street to 59th Street, was begun on February 13, 1936. It was opened to traffic on February 9, 1937, thus completing the elevated highway from Canal Street to 72nd Street.

Elevated highway, looking west at Duane Street, where construction was halted during World War II; the highway to the left was built later with a different design.

On August 23, 1934, Governor Herbert Lehman signed a bill authorizing construction of a southern extension of the elevated highway from Canal Street to the Battery. Construction on the first section of this, from Duane Street to Canal Street, was begun on January 24, 1938. Unlike previous sections of highway, which used granite blocks as a surface, concrete was used on the new section. The road was opened to traffic on February 4, 1939. A steelsuperstructure consisting of an arched bridge was built at Canal Street because the Holland Tunnel below ground restricted locations of bridge supports.

After an extended break due to World War II, construction on the final section of the southern extension, from Carlisle Street to Barclay Street, was begun on April 21, 1947. This section was expanded to reach Duane Street in the north, and was opened on November 29, 1948.

On December 15, 1973, the northbound lanes between Little West 12th Street and Gansevoort Street collapsed under the weight of a dump truck, which was carrying over 10 short tons (9,100 kg) of asphalt for ongoing repairs of the highway.[1] A four-door sedan followed the truck through the hole; neither driver was seriously injured. It took hours to back all the traffic off the span trapped behind the collapse. The day after, both directions were closed indefintely south of 18th Street. This not only closed off the oldest section (between Canal Street and 18th Street), but also the newest sections (south of Canal Street), because ramps south of the collapse only permitted northbound entrances and southbound exits. The southernmost northbound exit was at 23rd Street.

The Northbound lanes were closed from the Battery to 48th Street. The Southbound lanes were closed south of 18th Street, with traffic between 42nd Street and 18th Street reduced to one lane.[3] Additional segments and lanes were closed as the fate of the highway was being debated. The segment north of 59th Street could not be closed as there were no surface streets on which to reroute traffic. This section of Miller Highway remained in use into the 1980s, and has been since rebuilt.

After the immediate clean up of the collapsed section at Gansevoort Street, the West Side Elevated Highway remained standing, closed to traffic, while its fate was decided. Portions were demolished when they became a threat to people and/or property on ground level, or other non-city money was made available. There apparently was no rush. Federal Westway money was used to pay for the demolition of the elevated structure from 42nd Street south to the Battery, and for the paving of surface streets for use as a temporary roadway while the battle over Westway continued.[4]

The portion of the highway adjacent to the collapse (Jane Street north to 26th Street) came down first in 1977. Next, the portion between 26th Street and 42nd Street was demolished between November 1981 and the summer of 1982. Afterward, the highway from Jane Street south to Spring Street was torn down between the spring and fall of 1981. Then the highway from Spring Street south to the Battery was torn down between the summer of 1981 and the spring of 1982.

The segment between 43rd Street and 59th Street was left standing, as it was believed it could be refurbished and integrated into an extension of Westway. The remaining highway would be funded separately, as interstate funds (10-cent dollars) could not be used to connect an interstate highway to a limited use facility (in this case? the Henry Hudson Parkway. Ramp and lane improvements were made in 1981, permanently closing traffic on the Miller Highway south of 59th Street. Previously only northbound traffic had been allowed to enter the highway at 43rd Street, while southbound traffic was directed off the highway at 59th Street. The city eventually demolished the 43rd-59th Streets portion by October 1989.

Rehabilitation of the elevated structure between 59th Street and 72nd Street was completed in 1995. The only remaining section of vintage Miller Highway (complete with lampposts) is an abandoned southbound exit ramp stub for 70th Street.

^"West Side Traffic Could Get Worse During Work On Improving Roads". New York Times. January 12, 1981. Retrieved 2014-08-15. John Marino, the assistant commissioner for New York City Affairs in the State Department of Transportation, said that $17 million in Westway funds were being used for demolition work that began last month on the elevated West Side Highway. After the roadway is torn down, West Street beneath it will be resurfaced and used as an interim road until the Westway is built by about 1990, Mr. Marino said. ...